A326120 a(n) is the concatenation of n^1, n^2, ..., n^n.

1, 24, 3927, 41664256, 5251256253125, 6362161296777646656, 749343240116807117649823543, 864512409632768262144209715216777216, 981729656159049531441478296943046721387420489, 10100100010000100000100000010000000100000000100000000010000000000

Offset: 1

Author

Trevor Mulindi, Sep 10 2019

Keywords

• nonn
• base
• easy
• less

Comments

a(100) has 10200 digits.

a(n) is the concatenation of the n terms of the n-th row of A075363 triangle. - Michel Marcus, Sep 15 2019

Crossrefs

Cf. A007908, A019521, A019522, A053062, A075363.

Programs

Maple

a:= n-> parse(cat(n^j$j=1..n)):
seq(a(n), n=1..14);  # Alois P. Heinz, Jan 24 2021

Mathematica

a[n_] := FromDigits@ Flatten@ IntegerDigits[n^Range[n]]; Array[a, 10] (* Giovanni Resta, Sep 12 2019 *)

Python

def a(n): return int("".join(str(n**i) for i in range(1, n+1)))
print([a(n) for n in range(1, 11)]) # Michael S. Branicky, Jan 24 2021

Extensions

More terms from Giovanni Resta, Sep 12 2019